Hello apej6.
I too have been asking this question for YEARS and years.
From what I have found it looks like Ireland has the longest Autumn/Fall season. I have been there just once, but it was for 2 months and all of it was Autumn. Yes it was September and October, but from reading-up on Ireland & "where is/has the longest Autumn season?" - Ireland seems to be it.
I have also read that many location south of the Equator have a longer Autumn/Fall season. (Because of less direct sunlight during that time of year). But I am not sure where. (Australia & New Zealand are getting quite HOT in the Summer & with longer Summers each year).
I grew up in Northern New Jersey where Autumn is fantastic, but it seems to be getting shorter. Of course it feels this way as we get older, busier, etc, but many agree with me, and as you wrote, "it seems we go from Summer right into Winter". I have noticed it more as Winter right into Summer. Just this year (2014), it snowed in the middle of April. 2 days before that it was 81' F. 3 days after the snow it was 82' F.
*As I mentioned Ireland, places with a climate that is more 'wet' seem to have a longer Autumn. Someone listed Pennsylvania as having the longest Autumn currently... but they did not list where they read this, how, who measured this, etc...
- There are some spots like The great smokey mountains near Gaitlinsburg, TN that are on some lists - stating that their odd weather there because of the mountain system keeps more Autumn 'in' longer. It does look like a nice spot.
- Just from studying pics and videos I have noticed that British Columbia, Canada has a very long Autumn. People mentioned that Vancouver does get a lot of rain, but not as much as Seattle, WA, and if you move just 20 or so miles North or East of it you get far less rain and more of the 'long Autumn' weather.
- I have always been a huge fan of the tv show "Twin Peaks" which takes place in WA state. The show starts in late February (according to the 1st ep') and goes on for months and months - The entire show seems to be 100% Autumn!
(I know, TV script).
- For me it looks like:
1. Ireland (Scotland & England look great too)
2. B.C. Canada (Alberta looks great too,...)
3. WA / OR (check the rain fall 1st!) A friend of mine moved to Seattle loving the rain - then had to move back from where she came as the rain was just too much.
4. Great smokey Mt's, TN.
5. New England states.
-I have never been one for humid, sticky, far too hot (and getting Hotter!) Summer. I have a Celtic look to me if ya know what I mean. And now Winter is just getting too odd (and I am getting older!) especially lasting so long lately (with exception to 2005 when we had none) & arthritis kicking-in.
If anyone else has any good advice on where the longest amount of Autumn is please let us know.
E-